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Journal Article

Probing spin correlations using angle-resolved photoemission in a coupled metallic/Mott insulator system

MPS-Authors
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Kitamura,  Sota
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Moessner,  Roderich
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Oka,  Takashi
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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1809.08972.pdf
(Preprint), 6MB

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Citation

Sunko, V., Mazzola, F., Kitamura, S., Khim, S., Kushwaha, P., Clark, O. J., et al. (2020). Probing spin correlations using angle-resolved photoemission in a coupled metallic/Mott insulator system. Science Advances, 6(6): eaaz0611. doi:10.1126/sciadv.aaz0611.


Cite as: http://hdl.handle.net/21.11116/0000-0008-8F36-B
Abstract
A nearly free electron metal and a Mott insulating state can be thought of as opposite ends of the spectrum of possibilities for the motion of electrons in a solid. Understanding their interaction lies at the heart of the correlated electron problem. In the magnetic oxide metal PdCrO2, nearly free and Mott-localized electrons exist in alternating layers, forming natural heterostructures. Using angle-resolved photoemission spectroscopy, quantitatively supported by a strong coupling analysis, we show that the coupling between these layers leads to an "intertwined" excitation that is a convolution of the charge spectrum of the metallic layer and the spin susceptibility of the Mott layer. Our findings establish PdCrO2 as a model system in which to probe Kondo lattice physics and also open new routes to use the a priori nonmagnetic probe of photoemission to gain insights into the spin susceptibility of correlated electron materials.